Charge transport studies in fluorene - Dithieno[3,2-b:2′,3′-d]pyrrole oligomer using time-of-flight photoconductivity method

Manoj Parameswaran, Ganapathy Balaji, Tan Mein Jin, Chellappan Vijila, Sajini Vadukumpully, Fu Rong ZHU, Suresh Valiyaveettil*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

19 Citations (Scopus)

Abstract

Charge mobility characteristics of a newly synthesised 2,6-bis[2-(9,9-dihexyl-9H-fluorene)]-N-(4-hexylphenyl)-dithieno[3,2-b:2 ′,3′-d]pyrrole oligomer (DTP-FLU) was studied as a function of electric field and temperature using time-of-flight photoconductivity measurement. It is found that the DTP-FLU oligomer is a hole transporting material with a hole mobility of 7.7 × 10-6 cm2/Vs at an applied electric field of 2.9 × 105 V/cm at 298 K. The dependence of hole mobility with applied electric field and temperature is studied in detail by analyzing the experimental results using the Bassler's Gaussian disorder model and Correlated disorder model. The energetic disorder parameter (σ) = 100 meV, mobility pre-factor (μ) = 6.1 × 10-4 cm2/Vs and positional disorder parameter (Σ) = 2.4 were extracted using Gaussian disorder model. The film morphology and photophysical properties of this new oligomer are also studied in detail.

Original languageEnglish
Pages (from-to)1534-1540
Number of pages7
JournalOrganic Electronics
Volume10
Issue number8
DOIs
Publication statusPublished - Dec 2009

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

User-Defined Keywords

  • Charge transport
  • Correlated disorder model
  • Dithienopyrrole
  • Gaussian disorder model
  • Time-of-flight

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